There's a very similar post to this on pinkbike right now about choosing between Revs & Pikes, all be it both with the 20mm axel variety.

I have both of the forks in question a '08 426 coil u-turn rev (QR edition) and a 327 coil U-turn pike, the revs are defo a lighter duty set of forks, more suited to general trail riding an XC kinda things, the pikes are alot burlier and more suited to pointing down hill over ruff stuff.